A primer on dynamic sealing
Download
1 / 11

A primer on dynamic sealing - PowerPoint PPT Presentation


  • 177 Views
  • Updated On :

a primer on dynamic sealing. or, how to keep water from messing up all your cool moving contraptions. STATIC. DYNAMIC. DYNAMIC. O-ring (static seal). Specifications and help from Parker O-ring Handbook Male gland seals usually preferable Easier to machine external groove

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'A primer on dynamic sealing' - Samuel


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
A primer on dynamic sealing l.jpg

a primer on dynamic sealing

or, how to keep water from messing up all your cool moving contraptions

M J Stanway


Slide2 l.jpg

STATIC

DYNAMIC

DYNAMIC

dynamic sealing


O ring static seal l.jpg
O-ring (static seal)

  • Specifications and help from Parker O-ring Handbook

  • Male gland seals usually preferable

    • Easier to machine external groove

    • Less likely to damage seal during assembly

  • BUT prone to failure in rotating applications

dynamic sealing


Flexiseal l.jpg
FlexiSeal

  • Specifications and help from Parker Flexi-Seal Handbook

  • “C” shaped open o-ring with enclosed spring

  • Used by SeaGrant in thrusters and other reciprocating seals

  • Sold as “Spring-loaded PTFE seals” in McMaster (pg. 3244)

dynamic sealing


Flexiseal installation l.jpg
FlexiSeal installation

  • “heel first” 2-part gland seal advisable

    • Open end of seal faces higher pressure

    • Easy to machine

    • Easy to assemble without damaging seal

  • Other options include step-cut glands with/without snap ring retainer

dynamic sealing


Magnetic coupling l.jpg
Magnetic Coupling

  • Good for thrusters, not high enough accuracy for positioning actuators

  • Simple concept, potentially difficult design

  • COMPLETELY separated from fluid by casing material

dynamic sealing


Magnetic coupling7 l.jpg
Magnetic Coupling

  • 2-3 manufacturers make something currently that MIGHT work

  • WHOI uses them for thrusters on something

  • Might be able to design and fabricate our own at low cost

dynamic sealing


Mc design considerations l.jpg
MC Design Considerations

  • Use neodymium for high strength to volume ratio

  • Possible source: K&J Magnetics - $7.50 for 100 (1/4 x 1/8 x 1/16)

  • Even number of magnets, same on inner and outer rotor

  • Alternate poles around rotors

dynamic sealing


Mc design considerations9 l.jpg
MC Design Considerations

  • Rotor that sits inside in coupling would be wet side

    • allows for thin wall thickness in endcap between magnets (that part is in tension)

    • possible quick-disconnect props

  • Endcap most likely Aluminum

dynamic sealing


Other waterproofing l.jpg
Other waterproofing

  • Potting

    • Solid material

    • Insulates

    • Reduction in power

    • Good for sensors, not actuators

  • Oil pressure compensation

    • Can have power loss

    • System can be bulky & expensive

dynamic sealing


Seals in our rov l.jpg
Seals in our ROV

questions?

NOTE: pictures taken from Parker, Magnetic Technologies Ltd, Magnetic Materials and Components, and Bluefin Robotics

dynamic sealing


ad